package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import io.swagger.models.auth.In;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.StreamUtils;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
@Slf4j
public class ReportServiceImpl implements ReportService {

    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WorkspaceService workspaceService;

    /**
     * @param begin
     * @param end
     * @return
     */

    @Override
    public TurnoverReportVO getTurnover(LocalDate begin, LocalDate end) {
        //当前集合用于存放begin到end范围内的每天的日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)) {
            //计算指定日期的后一天。
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        List<Double> turnoverList = new ArrayList<>();
        for (LocalDate date : dateList) {
            //查询当前营业额的数据，状态为已完成5的订单金额合计
            //LocalTime.MIN 表示一天中的最小时间，即 00:00:00（午夜零点）
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            //select sum(amount) from orders where order_time > begin adn order_time <end and status 5
            Map map = new HashMap();
            map.put("begin", beginTime);
            map.put("end", endTime);
            map.put("status", Orders.COMPLETED);
            Double turnover = orderMapper.sumBymap(map);
            turnover = turnover == null ? 0.0 : turnover;
            turnoverList.add(turnover);
        }
        //让每个元素用逗号分隔
        String timelist = StringUtils.join(dateList, ",");
        //让每个钱用逗号分隔
        String turnlist = StringUtils.join(turnoverList, ",");

        TurnoverReportVO turnoverReportVO = new TurnoverReportVO();
        turnoverReportVO.setDateList(timelist);
        turnoverReportVO.setTurnoverList(turnlist);

        return turnoverReportVO;
    }

    /**
     * @param begin
     * @param end
     * @return 根据时间区间统计用户数量
     */
    @Override
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        //当前集合用于存放begin到end范围内的每天的日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)) {
            //计算指定日期的后一天。
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        //存放每天新增用户数 select count(id) from user where creat_time < ? amd creat_time>?
        List<Integer> newUserList = new ArrayList<>();
        //存放每天总用户数 select count(id) from user where creat_time<?
        List<Integer> totalUserList = new ArrayList<>();
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Map map = new HashMap();
            map.put("end", endTime);
            //总用户数量
            Integer totalUser = userMapper.countByMap(map);

            map.put("begin", beginTime);
            //新增用户数量
            Integer newUser = userMapper.countByMap(map);
            totalUserList.add(totalUser);

            newUserList.add(newUser);

        }
        //让每个元素用逗号分隔
        String lasttimelist = StringUtils.join(dateList, ",");
        String lastnewUserlist = StringUtils.join(newUserList, ",");
        String lasttotalUserlist = StringUtils.join(totalUserList, ",");

        UserReportVO userReportVO = new UserReportVO();
        userReportVO.setDateList(lasttimelist);
        userReportVO.setNewUserList(lastnewUserlist);
        userReportVO.setTotalUserList(lasttotalUserlist);

        return userReportVO;
    }

    //订单统计
    @Override
    public OrderReportVO getOrderStatistics(LocalDate begin, LocalDate end) {
        //当前集合用于存放begin到end范围内的每天的日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)) {
            //计算指定日期的后一天。
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        //存放每天订单数
        List<Integer> orderCountList = new ArrayList<>();
        //存放每天的有效订单数
        List<Integer> validOrderCountList = new ArrayList<>();

        //遍历datalist集合，查询每天的订单数和订单总数
        for (LocalDate date : dateList) {
            //查询每天的订单数 select count(id) from orders where order_time < ? and order_time>?
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Integer orderCount = getOrderCount(beginTime, endTime, null);
            //查询每天的订单总数 select count(id) from orders where order_time < ? and order_time>? and status=5
            Integer validOrderCount = getOrderCount(beginTime, endTime, Orders.COMPLETED);

            orderCountList.add(orderCount);

            validOrderCountList.add(validOrderCount);
        }
        //计算时间区间内的订单总数量
        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();
        //计算时间区间内的有效总数量
        Integer validOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();
        //计算订单完成率
        Double orderCompletionRate = 0.0;
        if (totalOrderCount != 0) {
            orderCompletionRate = validOrderCount.doubleValue() / totalOrderCount;
        }

        return OrderReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .orderCountList(StringUtils.join(orderCountList, ","))
                .validOrderCountList(StringUtils.join(validOrderCountList, ","))
                .totalOrderCount(totalOrderCount)
                .validOrderCount(validOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();


    }


    //根据条件统计订单数
    private Integer getOrderCount(LocalDateTime begin, LocalDateTime end, Integer status) {
        Map map = new HashMap();
        map.put("begin", begin);
        map.put("end", end);
        map.put("status", status);

        return orderMapper.countByMap(map);
    }

    //查询指定时间区间内的销量排名top10
    @Override
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);
        List<GoodsSalesDTO> salesTop10 = orderMapper.getSalesTop10(beginTime, endTime);

        List<String> names = salesTop10.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        String nameList = StringUtils.join(names, ",");

        List<Integer> numbers = salesTop10.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());
        String numberList = StringUtils.join(numbers, ",");

        return SalesTop10ReportVO.builder()
                .nameList(nameList)
                .numberList(numberList)
                .build();

    }

    @Override
    public void exportBusinessData(HttpServletResponse response) {
        //1.查询数据库，获取营业数据-查询最近30天
        //30天之前minusDays(30)
        LocalDate beginTime = LocalDate.now().minusDays(30);
        LocalDate endTime = LocalDate.now().minusDays(1);
        //Localdate 转localdatetime
        LocalDateTime begin = LocalDateTime.of(beginTime, LocalTime.MIN);
        LocalDateTime end = LocalDateTime.of(endTime, LocalTime.MAX);
        //查询概览数据
        BusinessDataVO businessDataVO = workspaceService.getBusinessData(begin, end);
        //2.通过poi将数据写入到excel文件中
        //this.getClassLoader().getClass().getResourceAsStream作用从类路径（Classpath）查找文件
        InputStream in = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");

        //基于末班文件创建一个新的excel文件
        try {
            XSSFWorkbook excel = new XSSFWorkbook(in);
            //填充数据- 时间
            //获取表格文件的标签页
            XSSFSheet sheet = excel.getSheet("Sheet1");
            sheet.getRow(1).getCell(1).setCellValue("时间: " + beginTime + "至" + endTime);
            //获取第4行，
            XSSFRow row = sheet.getRow(3);
            row.getCell(2).setCellValue(businessDataVO.getTurnover());
            row.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessDataVO.getNewUsers());
            //获取第5行，
            row = sheet.getRow(4);
            row.getCell(2).setCellValue(businessDataVO.getValidOrderCount());
            row.getCell(4).setCellValue(businessDataVO.getUnitPrice());
            //填充明细数据 30天之内的每一天
            for (int i=0;i<30;i++){
                //每次加1
                LocalDate date= beginTime.plusDays(i);
                //查询每一天的数据
                BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(date, LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));
//获得某一行
                row= sheet.getRow(7 + i);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessData.getTurnover());
                row.getCell(3).setCellValue(businessData.getValidOrderCount());
                row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessData.getUnitPrice());
                row.getCell(6).setCellValue(businessData.getNewUsers());
            }

            //3.通过输出流下载到客户端浏览器中
            ServletOutputStream outputStream = response.getOutputStream();
            //写回客户端浏览器
            excel.write(outputStream);

            //关闭资源
            outputStream.close();
            excel.close();


        } catch (IOException e) {
            throw new RuntimeException(e);
        }

    }
}
